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Study on Improving Borehole Stability of Gas Foam Drilling in Northeast Sichuan

Yang Jing-li

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Abstract

Analyzing the main factors of caving in upper terrestrial formations of Northeast Sichuan, three technologies of improving borehole stability of air foam drilling are discussed in this paper. Optimizing the zwitterionic surfactant AC-2(concentration0.5%)to meet requirement of carrying fluid of foam drilling; improving the separation capability to separate excess fluid; choosing borehole stabilizer YJB-I to enhance the inhibition.The applications in 7 wells show that borehole stability has been strengthened effectively.

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What this paper is about

Analyzing the main factors of caving in upper terrestrial formations of Northeast Sichuan, three technologies of improving borehole stability of air foam drilling are discussed in this paper. Optimizing the zwitterionic surfactant AC-2(concentration0.5%)to meet requirement of carrying fluid of foam drilling; improving the separation capability to separate excess fluid; choosing borehole stabilizer YJB-I to enhance the inhibition.The applications in 7 wells show that borehole stability has been strengthened effectively.

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Available abstract

Analyzing the main factors of caving in upper terrestrial formations of Northeast Sichuan, three technologies of improving borehole stability of air foam drilling are discussed in this paper. Optimizing the zwitterionic surfactant AC-2(concentration0.5%)to meet requirement of carrying fluid of foam drilling; improving the separation capability to separate excess fluid; choosing borehole stabilizer YJB-I to enhance the inhibition.The applications in 7 wells show that borehole stability has been strengthened effectively.

Key concepts: Borehole, Drilling fluid, Petroleum engineering, Drilling, Stabilizer (aeronautics), Geology, Geotechnical engineering, Underbalanced drilling

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